OK, after a year, I'm starting to have some issues with my GGG EI2 buttons...basically, during some hard play, one or two of them have the switch adapter swing out of place and not enable the button to make contact. I just tilt up the CP and re-engage the switch adapter and it's fine. It's not happening on all buttons...just 2 out of the 16 that I have.
I also have a stuck button every once in a while. I don't think this is a GGG issue, but rather an errant Vodka/Tonic that got spilt down the CP about a year ago.
Otherwise, I've been very happy with the EI2s and the lighting modules. I do, however, wish that the EI2s had the same tactile feel as the CLASSX buttons.
YMMV.
AJ